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Dissertations / Theses on the topic 'Chemical Transformation'

Author: Grafiati

Published: 6 September 2023

Last updated: 25 July 2025

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1

Singha, Rabindranath. "Chemical transformation of carbocyclic compounds and development of novel reaction protocols." Thesis, University of North Bengal, 2021. http://ir.nbu.ac.in/handle/123456789/4348.

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2

Amass, Dorothy Gwendoline. "Block co-polymerization by transformation reactions." Thesis, Aston University, 1996. http://publications.aston.ac.uk/9679/.

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The aim of this study was to use the transformation of anionic to metathesis polymerization to produce block co-polymers of styrene-b-pentenylene using WC16/PStLi and WC16/PStLi/AlEtC12 catalyst systems. Analysis of the products using SEC and 1H and 13C NMR spectroscopy enabled mechanisms for metathesis initiation reactions to be proposed. The initial work involved preparation of the constituent homo-polymers. Solutions of polystyryllithium in cyclohexane were prepared and diluted so that the [PStLi]o < 2x10-3M. The dilution produced initial rapid decay of the active species, followed by slowe

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3

Toke, S. M. "Synthetic studies in agrochemicals and chemical transformation of terpenes." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 1989. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3320.

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4

Vasconcelos, SebastiÃo Junior Teixeira. "Catalysts from hydrotalcite dopped with copper in chemical transformation of glycerol." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=14604.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico<br>The hydrotalcites are a class of layered double hydroxides with important physical and chemical properties. The use of this class of compounds in catalysis of specific reactions also requires many studies. The literature has exploited these materials in catalytic reactions in liquid phase with glycerol, particularly in hydrogenolysis reactions. The gas phase reactions with glycerol usually make use of acid catalysts. Thus, both the liquid phase reactions involving catalysts derived from hydrotalcite-like gas phase reactions invol

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5

Lucius, Ruth A. "Assessing Corn Quality And Transformation During Nixtamalization: A Physico-Chemical Approach." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1231442056.

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6

Lucius, Ruth A. "Assessing corn quality and transformation during nixtamalization a physico-chemical approach /." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1231442056.

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7

Singha, Rabindranath. "Chemical transformation of carbocyclic compounds and development of novel reaction protocols." Thesis, University of North Bengal, 2021. http://ir.nbu.ac.in/handle/123456789/4326.

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8

Chakraborty, Prasanta. "Chemical transformation of carbocyclic compounds and screening for their biological activity." Thesis, University of North Bengal, 2011. http://hdl.handle.net/123456789/1387.

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9

Reddy, T. I. "Synthesis and reactivity of push-pull ethylene systems; new zeolite catalyzed chemical transformations." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 1992. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3913.

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10

Massam, Alexandra. "A kinetic model for the transformation of phenol by peroxidase." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0008/MQ50641.pdf.

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11

Stark, I. "An atom-probe study of the chemical redistribution accompanying phase tranformations in steels." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253284.

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12

Reddy, K. V. "A) Nitrothioacetamides: synthesis and chemical transformations; B) Study of some weak interactions of the thiocarbonyl group." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 1992. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3912.

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13

Kang, Shin-Gyoo. "Fundamental studies of mineral matter transformation during pulverized coal combustion : residual ash formation." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13746.

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14

Singer, Jared Wesley. "Formation and Transformation of Amorphous Calcium-Magnesium Carbonates in Synthetic Seawater." Thesis, Alfred University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10184519.

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<p> The aqueous chemistry, precipitation, and crystallization of metal-carbonates comprises a vast field of research that underlies the urgency of CO<sub>2</sub> sequestration, ocean-acidification, and biomineralization. The results of recent experimental and computational studies suggest that amorphous calcium and magnesium carbonates are precipitated from supersaturated aqueous conditions by non-classical aggregation of ion pairs, dimers, dynamically-ordered-liquid-likeoxypolymers (DOLLOPS), and prenucleation clusters (PNCs). We present the first high field (20 T) <sup>43</sup>Ca and <sup>25

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15

De, Luca Gino. "Theory and simulation of microstructure transformation in cholesteric liquid crystalline materials : applications to biological fibrous composites." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79225.

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Current advanced engineering composites suffer from high-cost of manufacturing as well as design and processing weaknesses. On the other hand, nature produces high-performance composites under benign conditions using simple constituents. Hence, it seems that imitating nature constitutes the future of material science. This thesis attempts to answer some of the basic questions concerning the formation of biological fibrous composites. Microstructural studies of these materials have revealed that they exhibit a common architecture known as twisted plywood. This architecture results from t

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16

Gao, Wenyang. "Metal-Organic Frameworks as Potential Platforms for Carbon Dioxide Capture and Chemical Transformation." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6503.

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The anthropogenic carbon dioxide (CO2) emission into the atmosphere, mainly through the combustion of fossil fuels, has resulted in a balance disturbance of the carbon cycle. Overwhelming scientific evidence proves that the escalating level of atmospheric CO2 is deemed as the main culprit for global warming and climate change. It is thus imperative to develop viable CO2 capture and sequestration (CCS) technologies to reduce CO2 emissions, which is also essential to avoid the potential devastating effects in future. The drawbacks of energy-cost, corrosion and inefficiency for amine-based wet-sc

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17

Villa, Adam Daniel. "Lean transformation methodology and implementation in biopharmaceutical operations." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44322.

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Thesis (M.B.A.)--Massachusetts Institute of Technology, Sloan School of Management; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering; in conjunction with the Leaders for Manufacturing Program at MIT, 2008.<br>Includes bibliographical references (p. 77-78).<br>Amgen's Operations division is responsible for the production, release and distribution of commercial and clinical products. Due to industry consolidation, impending competition and revenue impacts, Amgen is facing the need to rapidly improve the Operations division and align different manufacturing sites.

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18

Röger, Hans Peter. "Application of the transformation of 1,2,4-Trimethylbenzene to monitor the chemical vapour deposition of Tetraethoxysilane over ZSM-5." Doctoral thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/19813.

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The present work reports an improved chemical vapour deposition (CVD) technique using low temperature, tetraethoxysilane (TEOS) and repeated CVD-calcination cycles. This results in a better control of the external surface activity and the pore mouth size of ZSM-5. In search for effective characterisation tools and a model reaction which involves molecules which are critical in size relative to the size of the ZSM-5 channels, the transformation of 1,2,4-trimethylbenzene (1,2,4-TMB) was investigated with respect to the reaction network, the role of the micropore space and the response to CVD tre

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19

Kasap, Hatice. "Carbon nitride for solar H2 production coupled to organic chemical transformations." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/289454.

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Artificial photosynthesis utilises solar-light for clean fuel H2 production and is emerging as a potential solution for renewable energy generation. Photocatalytic systems that combine a light harvester and catalysts in one-pot reactor are promising strategies towards this direction. Yet, most of the reported systems function by consuming excess amount of expensive sacrificial reagents, preventing commercial development. In this thesis, carbon nitrides (CNx) have been selected as non-toxic, stable and low-cost photocatalysts. CNx are first introduced as efficient light harvesters, to couple al

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20

Kumar, Priyank Vijaya. "Enhanced electrical, optical and chemical properties of graphene oxide through a novel phase transformation." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98736.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 86-98).<br>Graphene oxide (GO) is a versatile, solution-processable candidate material for next-generation, large-area, ultrathin electronics, optoelectronics, energy conversion and storage technologies. GO is an atom-thick sheet of carbon functionalized with several oxygen-containing groups dominated by the epoxy and hydroxyl functional groups on the basal plane, with carboxyls and lactols at the sh

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21

Chinalia, Fabio Alexandre. "Biological and chemical monitoring of the transformation of recalcitrant organic compounds in river sediment." Thesis, University of Aberdeen, 2002. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU153937.

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This thesis reports on the degradation of two different models of organic pollutants in two contrasting Scottish river sediments. The first type of sediment (sediment 1) was collected close to an urban area with high percentage of organic matter content (1.3%). The second type of sediment (sediment 2) was collected from a pristine area and was less organic (0.2%). As organic pollutant model, radiolabelled (14C) 2,4-Dichlorophenoxyacetic acid (Acid-ring-UL-14C) and Naphthalene (Naphthalene-1-14C) were amended to individual microcosms (50g of sediment and 50ml of river water) at different concen

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22

Jayarathne, Ayomi L. "Transformation of physical and chemical properties of metals built-up on urban road surfaces." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/122560/1/Ayomi_Jayarathne_Thesis.pdf.

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This project was a step forward in developing new knowledge relating to the influence of transformations that metals undergo during dry weather periods whilst they are deposited on urban road surfaces, on stormwater quality. Further, a new risk assessment method was proposed based on the transformation characteristics of metals. The generic outcomes of this study are expected to contribute to the implementation of appropriate stormwater pollution mitigation strategies to enhance stormwater reuse.

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23

Garamendi-Colos, Virginia, Mercedes Cano-Lazarte, Nestor Mamani-Macedo, Carlos Raymundo, and Francisco Dominguez. "Agile Inventory Management Model Under a Digital Transformation Approach for Stockout Reduction in Chemical Industry’s MSE." Springer, 2020. http://hdl.handle.net/10757/656371.

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El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado.<br>Through digital transformation, company processes that are, or could be, conducted manually are reduced; moreover, human tasks are automated when software-based processes are established. This paper analyzes the adoption of a digital transformation tool to manage inventory through the application of agile models, such as Just-In-Time, and the use of Enterprise Resource Planning (ERP), employing the Deming cycle method, as several unclear empiri

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24

Gonzalez, Richard. "Biocatalytic transformation of steroids using solvent-enhanced Beauveria bassiana." Diss., University of Iowa, 2015. https://ir.uiowa.edu/etd/1610.

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This dissertation describes efforts to improve the oxidative capacity of n-alkane- induced Beauveria bassiana; a fungus and a versatile whole cell biocatalyst used in the biotransformation of steroids. n-Hexadecane was used as the carbon source during the growth of B. bassiana, presumably to induce the expression of oxidative enzymes, thus enhancing the oxidation of unactivated carbons. Dehydroepiandrosterone (DHEA) is an essential endogenous male-hormone and serves as a metabolic intermediate in the production of more potent androgens. Using DHEA as a substrate also provides the opportunity t

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25

Savage, Nicholas Henry. "Studies of the chemical transformation of atmospheric nitrogen and sulphur compounds by comparing data with models." Thesis, University of East Anglia, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302208.

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26

Dzyazko, Yu S., E. V. Mokrousova, Yu M. Volfkovich, V. E. Sosenkin, and N. F. Nikolskaya. "Labile collagen matrix: transformation of hierarchical structure at nano- and micro-levels influenced by chemical treatment." Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20527.

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Porous structure both of natural skin and collagen matrix obtained by chemical treatment of the skin with alkaline and acidic solutions, tannage with a Cr3+-containing solution, vegetable retannage and modification with bentonite was researched using scanning and transmission electron microscopy as well as standard contact porometry. Each stripe of porogrammes has been related to elements of multilevel structure. The pores were recognized using octane as a working liquid, the results obtained by this manner were used to determine loosening-compaction and ordering-disordering at each level of

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27

Busireddy, Bhargavi. "Study of Mercury Transformation with Chlorinated Species under Homogeneous and Heterogeneous Conditions." University of Dayton / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1299087195.

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28

Shiraiwa, Manabu [Verfasser]. "Kinetic modeling and experiments on gas uptake and chemical transformation of organic aerosol in the atmosphere / Manabu Shiraiwa." Mainz : Universitätsbibliothek Mainz, 2011. http://d-nb.info/1025263596/34.

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29

ALMEIDA, CIBELE MARIA STIVANIN DE. "STUDIES ON THE ORIGIN AND TRANSFORMATION OF SELENIUM AND ITS CHEMICAL SPECIES ALONG THE PROCESS OF PETROLEUM REFINING." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2008. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=12188@1.

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PETRÓLEO BRASILEIRO S. A.<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Diferentes métodos espectrométricos de análise, incluindo ICP OES, ICP-DRCMS e Q-ICPMS com técnicas hifenadas (geração de hidreto, vaporização eletrotérmica ou cromatografia de íons), foram aplicados na caracterização química de 16 óleos e 41 amostras de efluentes aquosos de uma refinaria de petróleo. O objetivo específico deste estudo foi o de entender o comportamento do selênio (Se) e de suas espécies químicas ao longo do processo de geração e tratamento dos efluentes desta unidade industrial

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30

Bowers, Gregory Arland. "Chemical Applications in Techniques of Emerging Significance: Nanoparticle Transformation in Mitochondria and Relative Tautomer Populations in Cellular Automata." Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1516085869626903.

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31

Pannier, Andy Joseph. "Reductive transformation of 2,4,6-Trinitrotoluene by Yarrowia lipolytica AN-L15 under conditions of different initial pH of the culture medium or in the presence of ferrihydrite." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/pannier/PannierA0509.pdf.

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Batch and column studies were conducted to examine the difference in the transformation pathways of 2,4,6-trinitrotoluene (TNT) reduction by a hemiascomycetous yeast (Yarrowia lipolytica AN-L15) under conditions of different initial pH of the culture medium or in the presence or absence of ferrihydrite. Using high performance liquid chromatography (HPLC), it was observed that Y. lipolytica AN-L15 was able to transform TNT at three different initial proton concentrations of the culture medium: pH 7.0, pH 6.5, and pH 4.5. In the presence of TNT, Y. lipolytica AN-L15 showed preferential growth (O

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32

Hoffman, Andrew J. 1991. "The environmental transformation of American industry : an institutional account of organizational evolution in the chemical and petroleum industries, (1960-1993)." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11744.

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33

Sierra-Irizarry, Eddie A. "Processing of polypropylene by melt transformation coextrusion process, study of flow birefringence, using an internally cooled die." Ohio : Ohio University, 1987. http://www.ohiolink.edu/etd/view.cgi?ohiou1183061054.

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34

Yan, Kai [Verfasser]. "Transformation of biogenic carbohydrates into levulinic acid and further hydrogenation using supported nanoparticle catalysts synthesized by chemical fluid deposition / Kai Yan." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2011. http://d-nb.info/1018171967/34.

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35

Heidarian, Höckerfelt Mina. "On the chemical and processing stability of pharmaceutical solids : Solid form dependent water presenting capacity and process induced solid form transformation." Doctoral thesis, Uppsala universitet, Institutionen för farmaci, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-261785.

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There is a need for improving our knowledge and understanding about formation mechanisms and nature of amorphous state in order to prevent the unintended presence of disorder in solid pharmaceutical products and reduce the related stability issues. The suggested theory that water binding capacity of amorphous cellulose affects the chemical stability of hydrolysis sensitive drugs in formulations with cellulose based excipients needs a clarification and water-cellulose interaction profiles need to be examined. This thesis has addressed these questions. Chemical, mechanical and thermal methods h

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36

Burtin, Pierre. "Transformation des alumines de transition en alumine alpha. Influence d'éléments étrangers sur la stabilité des alumines." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 1985. http://tel.archives-ouvertes.fr/tel-00845793.

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Les oxydes et hydroxydes d'aluminium sont des produits chimiques très répandus industriellement. La principale utilisation des alumines est la production de l'aluminium, mais elles sont également très employées dans l'industrie des abrasifs, des céramiques et des matériaux réfractaires. De même parmi les oxydes métalliques utilisés dans les processus catalytiques, l'alumine est l'un des plus employés. Elle peut être utilisée comme catalyseur intrinsèque, ou comme l'un des éléments d'un catalyseur multicomposant ou encore comme support d'un catalyseur métallique. En tant que support de catalyse

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37

Usman, Muhammad. "Formation of mixed Fe"-Fe"' oxides and their reactivity to catalyze chemical oxidation : remediation of hydrocarbon contaminated soils." Thesis, Nancy 1, 2011. http://www.theses.fr/2011NAN10093/document.

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Le thème principal de cette recherche est la remédiation des sols contaminés par des hydrocarbures en utilisant des traitements d'oxydation chimique à pH neutre. Les minéraux à base de fer sont susceptibles de catalyser cette réaction d'oxydation. L'étude concerne donc dans un premier temps la synthèse des minéraux réactifs contenant des espèces FeII et FeIII (la magnétite et la rouille verte) et, dans un second temps, leur utilisation pour catalyser l'oxydation chimique. Les procédés d'oxydation testés incluent l'oxydation de type « Fenton-like (FL) » et de type persulfate activé (AP). La for

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38

Das, Saikat. "FUNDAMENTAL STUDIES OF SURFACTANT TEMPLATED METAL OXIDE MATERIALS SYNTHESIS AND TRANSFORMATION FOR ADSORPTION AND ENERGY APPLICATIONS." UKnowledge, 2015. http://uknowledge.uky.edu/cme_etds/48.

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This work addresses fundamental aspects of designing templates and curing conditions for the synthesis of mesoporous metal oxide thin films. The first section addresses selection of cationic-carbohydrate surfactant mixtures to synthesize templated silica thin films for selective adsorption of simple carbohydrates based on molecular imprinting. Nuclear magnetic resonance and fluorescence spectroscopy results suggest a novel structure for mixtures of alkyl glucopyranosides or xylopyranosides with cationic (trimethylammonium) surfactants. Despite thermodynamically favorable mixing, the carbohydra

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39

Monastyrsky, G. E. "The Peculiarities of Martensite Morphology in Nano- and Inhomogeneous Spaces." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35232.

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The article describes certain experimental situations, in which the small volumes available for the phase transformation can dramatically affect the morphology, substructure of martensite, martensitic transformation itself. Martensitic structures in standalone nanoparticles as well as that one’s embedded in extrinsic matrix, joint nanograins and multiply connected spaces, gradient structures are given consideration. Much attention is paid to the problem of nucleation and propagation of martensitic phase through peculiar spaces having inhomogeneities and complex 3D connectivity with each o

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40

Delattre, Anastasia. "Synthèses chimiques, transformation de phase et étude des propriétés magnétiques des nanoparticules de FePt et FePd." Phd thesis, Grenoble, 2010. http://tel.archives-ouvertes.fr/tel-00570569.

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Ce travail porte sur la compréhension de la synthèse par voie chimique de nanoparticules (NPs) de FePt et FePd, et sur la recherche de voies pour obtenir la phase cristalline L10, en évitant les phénomènes de coalescence associés au recuit thermique. En remplaçant l'oleylamine par l'hexadécanenitrile, les NPs de FePt de 3-4 nm ont une composition interne plus homogène. Par une étude systématique (plan d'expérience reposant sur les tables de Taguchi), nous avons développé la synthèse de NPs de FePd, en mettant en évidence l'impact de chaque ligand et du réducteur. Afin d'induire la transition d

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Som, Marie-Pierre. "ÉTUDE MOLÉCULAIRE DES COMPOSÉS ORGANIQUES DE COMPOSTFORMATION, TRANSFORMATION DANS LES SOLSACTION SUR LES PROPRIÉTÉS DES SOLS." Phd thesis, Université de Poitiers, 2006. http://tel.archives-ouvertes.fr/tel-00157336.

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Le but de cette étude était de caractériser à l'échelle moléculaire la maturité d'un compost de déchets verts et de biodéchets et son incorporation dans un sol.<br />Cinq nouveaux critères de maturité ont été déterminés par thermo-gravimétrie et thermochimiolyse. Cette technique permet d'observer l'augmentation de l'activité bactérienne (rapport acides ramifiés/linéaires et mono/diacides). De plus l'oxydation de composés triterpèniques dans les lipides est mise en évidence. L'évolution de la matière organique (MO) des substances humiques (SH) ne fait pas apparaître de lien direct avec les lipi

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42

Biborski, Andrzej. "Chemical ordering kinetics and thermal vacancy thermodynamics in B2 binary intermetallics : simulation study." Praca doktorska, Strasbourg, 2010. http://www.theses.fr/2010STRA6196.

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Les alliages intermétalliques de structure B2 sont des matériaux prometteurs pour leurs propriétés physiques. Une concentration anormalement élevée de lacunes est observée dans les alliages B2 très ordonnés. Les sauts atomiques élémentaires ayant lieu via des sauts de lacunes, il est surprenant que la vitesse d’évolution de l’ordre est bien plus basse dans NiAl ordonné B2 – système où la concentration de lacunes est très haute – que dans le système L12 – Ni3Al où la concentration de lacunes est bien plus basse. Ce phénomène a souvent été expliqué par l’existence dans cette structure de défauts

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43

Wang, Xiujun. "Melt transformation coextrusion of polyethylene and polybutylene measurements of streamline flow and pressure effect on birefringence and interface visualization in the MTCE process." Ohio : Ohio University, 1989. http://www.ohiolink.edu/etd/view.cgi?ohiou1182182580.

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44

Burger, Emilien. "Métallurgie extractive protohistorique du cuivre :Etude thermodynamique et cinétique des réactions chimiques de transformation de minerais de cuivre sulfurés en métal et caractérisation des procédés." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2008. http://tel.archives-ouvertes.fr/tel-00368257.

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Cette thèse porte sur l'étude des deux étapes principales des procédés de transformation de la chalcopyrite (CuFeS2) en cuivre, le grillage et la fusion scorifiante, pour répondre à un problème archéologique. Pour chaque étape, des simulations expérimentales sont effectuées en laboratoire en modélisant les conditions d'un réacteur protohistorique. D'une part, la cinétique de grillage est étudiée par thermogravimétrie couplée à l'analyse physicochimique des produits intermédiaires. D'autre part, les simulations de fusion scorifiante sont principalement menées pour mesurer l'influence respective

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Guengard, Hélène. "Transitions de phases structurales dans des elpasolites fluorées." Phd thesis, Université Sciences et Technologies - Bordeaux I, 1994. http://tel.archives-ouvertes.fr/tel-00140033.

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De nouveaux fluorures A2BMF6 de structure type elpasolite ont été caractérisés. Des déterminations structurales ont été réalisées soit sur des poudres soit sur des monocristaux. Diverses techniques d'analyse (microcalorimétrie, diffraction X, Résonance Paramagnétique Electronique, mesures optiques) ont permis de mettre en évidence des transitions de phases. Ces composés comportent des entites octaédriques MF6 isolés et rigides pouvant présenter des mouvements de rotation, en particulier dans la variété cubique stable a haute température. Lorsque la température diminue, le "gel" des octaèdres d

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Chambon, Flora. "Transformation de la cellulose par catalyse hétérogène." Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00829774.

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La cellulose, bio-polymère composé d'unités glucose, est un composé largement disponible au sein de la biomasse lignocellulosique. Sa dépolymérisation sélective en synthons se heurte cependant à sa forte résistance aux transformations chimiques du fait de sa structure semi-cristalline. L'objectif de la thèse est d'étudier la transformation de la cellulose par catalyse hétérogène. Il a été montré qu'une dépolymérisation partielle de la cellulose en milieu aqueux était promue par les protons issus de l'autoprotolyse de l'eau à 190°C. L'ajout d'un catalyseur solide ayant une acidité de BrØnsted f

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Salvetti, Marie-Gabrielle. "De l'organique au minéral : Étude expérimentale et modélisation de la transformation d'un précurseur polysilazane en "carbonitrure de silicium"." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 1994. http://tel.archives-ouvertes.fr/tel-00843575.

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Le but de cette étude est de comprendre la transformation thermique d'un polysilazane en carbonitrure de silicium afin de maitriser la composition de la fibre céramique dont il est le précurseur. Les deux phénomènes qu'il convient d'éviter dans l'élaboration de telles fibres sont l'oxydation et la cristallisation qui provoque la perte totale de résistance mécanique. Les différentes étapes de la transformation sont, dans un premier temps, ce que l'on désigne par transition organique-minéral ou minéralisation dans laquelle le polymère précurseur perd son caractère organique avec la production d'

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48

Mateos, David. "Transformation de matériaux énergétiques par oxydation hydrothermale : Etude cinétique globale et simulation du procédé en régime permanent sur des composés modèles." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2003. http://tel.archives-ouvertes.fr/tel-00010254.

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Les procédés d'oxydation hydrothermale en milieu fluide supercritique offrent une alternative innovante à la gestion des matériaux énergétiques en "fin de vie" et des rebus de production. Afin d'évaluer et de promouvoir le développement de cette technologie, deux pilotes d'oxydation hydrothermale ont été mis en place. Le premier fonctionne en mode fermé et utilise un réacteur chemisé titane. Il est dédié aux études de faisabilité sur des produits réels tels que des propergols et les différents éléments qui les composent (liants, charges énergétiques...). Le second quant a lui fonctionne en mod

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Cerniauskaite, Deimante. "Glucosinolates - myrosinase : synthèse de substrats naturels et artificiels, inhibiteurs et produits de transformation enzymatique." Phd thesis, Université d'Orléans, 2010. http://tel.archives-ouvertes.fr/tel-00739777.

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Les glucosinolates sont des composés thio-b-D-glucopyranosiques anioniques de structure originale présentsdans de nombreux végétaux, essentiellement dans la famille des crucifères. Les glucosinolates sont hydrolysés parune enzyme appelée myrosinase (thioglucoside glucohydrolase E.C. 3.2.3.147.) Le système myrosinase-glucosinolate est un couple enzyme-substrat que nous avons cherché à mieux comprendre et développer. Aussi l'inefficacité des méthodes classiques envers certaines molécules hétéroaromatiques et la quantité restreinte de recherches effectuées sur ce sujet nous a encouragé à vouloir

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Gomes, Christophe. "Une approche diagonale pour la transformation catalytique du dioxyde de carbone." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00954408.

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Les émissions de dioxyde de carbone n'ont de cesse d'augmenter avec l'exploitation massive des hydrocarbures pour la production d'énergie et de composés chimiques. Dans ce contexte, le développement d'une économie permettant de limiter l'impact écologique de notre mode de vie actuel se fait de plus en plus pressant et l'utilisation du CO2 comme matière première carbonée constitue une alternative attrayante aux ressources fossiles pour la production de consommables chimiques. Ces travaux de thèse ont porté sur le développement de nouvelles transformations catalytiques du CO2 selon une nouvelle

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